Magnetic chuck



FIG. 1 is a perspective view of a magnetic chuck showing my new design;

FIG. 2 is a front elevational view;

FIG. 3 is a rear elevational view;

FIG. 4 is a top plan view;

FIG. 5 is a bottom plan view; and,

FIG. 6 is a right side elevational view, the left side elevational view being a mirror image thereof. 

The ornamental design for a magnetic chuck, as shown and described. 